Wrinkle Film Composition UV Curing Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for forming films with wrinkle structures for OLEDs and sensors lack control over wrinkle size and formation, as they rely solely on curable compounds without adequate disclosure of photoinitiator combinations and photo-curing parameters.
Innovation Solution
A composition comprising a first photo-curable agent and a first photoinitiator, where the cut-off wavelengths of light transmittance and absorbance are specifically defined, along with additional photo-curable agents and photoinitiators, is used to form a film with a wrinkle structure through UV irradiation, allowing for modulation of wrinkle size and structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If only curable compounds are used to form wrinkled films, then wrinkle structure can be formed, but control over wrinkle size and formation is insufficient
Solution Approach 1:
The patent applies parameter changes by systematically varying photoinitiator concentration (0.01-10 wt%), light intensity, exposure time, and photo-curable agent composition to achieve precise control over wrinkle size and formation. This resolves the contradiction by using controllable parameter adjustments rather than complex device modifications.
Solution Approach 2:
The patent introduces dynamic control through adjustable photo-curing parameters including variable light intensity, exposure time, and photoinitiator concentration. This enables real-time optimization of wrinkle formation, transforming a static process into a dynamically controllable one that achieves precise wrinkle size control without increasing device complexity.
2Productivity
If photoinitiator concentration is increased to speed up photo-curing, then photo-curing rate increases, but light absorbance increases reducing light transmittance
Solution Approach 1:
The patent optimizes photoinitiator concentration within the range of 0.01-10 wt% to achieve the optimal balance between photo-curing rate and light transmittance. This parameter optimization resolves the contradiction by finding the sweet spot where sufficient curing speed is achieved without excessive light absorption that would prevent adequate light penetration.
Solution Approach 2:
The patent uses partial action by applying multiple passes of UV irradiation at lower intensities rather than a single high-intensity exposure. This approach allows light to penetrate deeper into the coating layer while still achieving complete curing, effectively resolving the trade-off between curing rate and light transmittance.
3Reliability
If UV irradiation is applied to form photo-cured layer, then film formation is achieved, but wrinkle structure control is insufficient
Solution Approach 1:
The patent applies preliminary action by first forming a uniform photo-cured layer through controlled UV irradiation before wrinkle formation occurs. This initial layer serves as a stable foundation that enables subsequent precise wrinkle structure development, resolving the contradiction by establishing reliability first and then achieving precision.
Solution Approach 2:
The patent employs periodic UV irradiation with controlled exposure times and intervals, allowing the film to undergo cyclic stress relaxation that promotes organized wrinkle formation. This periodic action transforms the irradiation process from a simple curing step into a controlled wrinkle-forming mechanism, achieving both reliable film formation and precise wrinkle structure control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method enables the formation of films with controlled wrinkle structures, suitable for light scattering and extraction applications, by optimizing the photo-curing reaction rate and concentration of photoinitiators, resulting in films with diverse applications in displays and illuminations.
Implementation Method 1
a composition for forming a film having a wrinkle structure including a first photo-curable agent and a first photoinitiator dissolved in the first photo-curable agent
Implementation Method 2
the first cut off wavelength of light absorbance is the shortest light wavelength of wavelengths having less than or equal to about 0.05 of light absorbance when light is irradiated to a diluted solution layer
Implementation Method 3
the first cut off wavelength of light transmittance of the first photo-curable agent is equal to or is greater than a first cut off wavelength of light absorbance of the first photoinitiator
Implementation Method 4
a composition for forming a film having a wrinkle structure spontaneously only by ultraviolet (UV) irradiation
Data Source
AI summary
A composition for forming film having wrinkle structure and a method of forming the film are disclosed. The composition includes photo-curable agent and photoinitiator dissolved in the photo-curable agent. The cut off wavelength of light transmittance of the photo-curable agent is greater than the cut off wavelength of light absorbance of the photoinitiator. Photo-cured thin film is formed at the upper portion of composition layer at an initial time period of irradiation. By subsequent contraction, the photo-cured thin film forms wrinkles. The wrinkle structure is controlled by the relation of the cut off wavelength of light transmittance of the photo-curable agent and the cut off wavelength of light absorbance of the photoinitiator, the photo-curing rate of the composition and the thickness of the composition layer, and the photoinitiator concentration, etc., before photo-curing. The film may increase the emission efficiency of LED and OLED and the sensing effect of sensor.